First off, this is the original link and creator here:
https://www.gta5-mods.com/maps/the-simpsons-hit-run-level-1-multifive
Their version currently doesnt work with FiveM so I changed a few things around so it can work on FiveM.
As you probably know by now, this is for "FiveM Only".
All you have to do is drop this folder in your Resources folder in your server, then add spring to your server.cfg
No tutorial video at the moment, if you dont have a server up yet, watch this video: https://bit.ly/2yhk37Q
Once you load in your server, you will be falling from the sky, so you need a trainer with "No Clip" so you can stop in mid air and look around, you should see the entire Simpsons map, then navigate towards the map with No Clip.
Like I said before theres no tut video on this at the moment so I suggest if you dont have any knowledge on how to use or install this, then dont bother. I will be also releasing mods/scripts for SP gta5 also!!
Enjoy, this is an early release to my patrons before it goes public then I will have a tutorial video for it showing how to install!